632 CRETACEOUS PALEONTOLOGY. 



Genus CYMBOPHORA Gabb. 

 Cymbophora lintea (Conrad). 

 Plate LXXL, Figs. 9-13. 



1860. Cardium (Protocardium) linteum Con., Jour. Acad. Nat. 



Sci. Phil., 2nd ser., vol. 4, p. 278, pi. 46, fig-. 17. 



1861. Cardium lintea Gabb, Synop. Moll. Cret. Form., p. 163 



(107). 

 1870. Veleda lintea Con., Am. Jour. Conch., vol. 6, p. 74. 



1875. Veleda lintea Con., Kerr's Geol. N. Car., App., p. 9, pi. 



i, fig. 26. 



1876. Cymbophora lintea Gabb, Proc. Acad. Nat. Sci. Phil. 



(1876), p. 306. 

 1886. Veleda lintea Whitf., Pal. N. J., vol. i (Monog. U. S. 



G. S., vol. 18), p. 172, pi. 23, figs. 18-21. 

 1905. Cymbophora lintea Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 17. 



Description. The dimensions of two separate valves of this 

 species, the larger specimen a right and the smaller a left valve, 

 are: length, 18.5 mm. and 16 mm.; height, 15 mm. and 13 mm.; 

 convexity, 5 mm. and 3.5 mm. Shell ovate-subtriangular in out- 

 line. The anterior and posterior cardinal margins meeting at 

 the beak in an angle of about 110, curving regularly into the 

 anterior and posterior margins below; anterior margin rather 

 sharply rounded, its greatest extent below the mid-height of the 

 shell; ventral margin broadly convex; posterior margin more 

 or less sharply rounded or somewhat pointed below, oblique 

 above, subtruncate or gently convex. Beaks a little in front of 

 the middle of the shell or sometimes nearly central in position, 

 slightly incurved, pointing forward, elevated a little above the 

 hinge-line. Valves moderately convex, with a more or less ob- 

 scure umbonal ridge extending obliquely from the beak to the 

 postero-basal extremity; post-umbonal slope rather abrupt, cen- 

 tral portion of the valve gently convex, the anterior and posterior 

 cardinal slopes about equally abrupt. In the casts the umbonal 



